Robert Royar writes: Well, I think my primary idea is to avoid extended REs. However, it would also be possible to test which switch the native (= on the default $PATH for the distro) sed accepts. Choosing tool names based on OS probably is a bad idea; you don't know that the non-native version will be available. (I'm sure you know that, I'm just being complete for the archives.) _______________________________________________ XEmacs-Beta mailing list XEmacs-Beta(a)xemacs.org http://lists.xemacs.org/mailman/listinfo/xemacs-beta